Forms fail to load when deployed to SSAS 2025

Symptoms

After a successful application deployment to SSAS 2025, users encounter errors when loading forms:

• Input forms: "The server sent an unrecognizable response."
• Read-only forms: "Internal error: An unexpected exception occurred."

The application deployment itself completes without errors. Forms fail only when users attempt to load them.

Affected environments

This issue affects applications deployed to SSAS 2025 Enterprise Edition or SSAS 2025 Developer Edition that use SSAS proactive caching (the default setting).

SSAS 2025 Standard Edition, SSAS 2022 and earlier, and applications already using Kepion proactive caching are not affected.

Cause

SSAS 2025 replaced its SQL client library, moving from System.Data.SqlClient to Microsoft.Data.SqlClient. This change breaks the SQL Server table notification mechanism that Kepion relies on for SSAS proactive caching, causing errors when forms query data.

Kepion proactive caching uses its own change-detection mechanism, so it is unaffected by this change. See the Workaround section below.

Workaround

Switch the application from SSAS proactive caching to Kepion proactive caching. For more information about proactive caching in Kepion, see application configurations.

Steps:

1. Log in to the Kepion application as a system administrator.
2. Navigate to the System module.
3. Select the affected application.
4. Click the Advanced tab.
5. In the Proactive Caching dropdown, change the value from "Use SSAS proactive caching when available" to "Use Kepion proactive caching". 
6. Click Save. 
7. Redeploy the application.

Repeat these steps for each affected application in the environment.